Lifting-magnet.



PATENTED JULY 7, 1908.

V. R. BROWNING.

LIFTING MAGNET.

APPLICATION FILED DEO.14,1906.

PATENT oEEIoE.

` VICTOR It. BROWNING, OF NOTTINGHAM, OHIO.

Larme-MAGNET.'

Specification of Letters Patent.

Patented July 7, 1908.

Application led December 14, 1906. Serial No. 847,749.

To all lwhom it may concem:

Be it known that I, Vieron R. BRowNING, a citizen of the United States, residing at Nottingham, in the county of Cuyahoga and State of Ohio, have invented a certain lnew and useful Improvement in Lifting-Magnets,

of which the following is a full, clear, and exact description, referencebeing had to the accompanying drawings.

This invention relates to lifting magnets, and has for its objects the reduction of a device of this character whic will be simple. and economical in construction, safe and effectual in operation, and one which, by simply varying the arrangement of the electrical connections in the magnet coils, may be used with currents of different voltages.

In the drawings forming'a art of this a plication, Figure 1 is a top lan view of t e magnet with the cover for t e switch casing removed. Fig. 2 is a transverse section taken through Fig.- 1, substantially on the line 2 2, the eye-piece by means of which the magnet is lifted, being shown in elevation. Fig. Sis a bottom plan view of the magnet, and Fig. 4 is a diagrammatic view of the magnet coils and the means whereby these coils may be placed in parallel or in series, as desired.

Taking up a specific description by reference to the accompanying drawings, l represents the main member of the magnet,on the upper side of which there is provided at the center an eye-piece 2, by means of which the magnet may be lifted. Projecting from thelower side of this member, at the center i thereof, is the innenpole 3 of tbe magnet'.-

Bolted or otherwise securely fastened to the outer periphery of the member 1, is the outer pole 4, said ole being in the form of a ring, as shown in ig. 3. These pole pieces ofthe magnet may be formedof any suitable magnetic material, but preferably of cast stee that material having the necessary magnetic qualities and possessing the re uisite strength, it being understood that ifting magnets of this character are intended for taking up and trans orting very heavy loads. On its inner surflace, and near the lower edge thereof, the pole piece 4 is provided with an inwardly projecting ledge or shoulder 5, upon which rests an annular late 6,

said plate being formed of a suitab e nonmagnetic material, such as brass or copper. This ring surrounds the inner pole piece, and

the lower side of said projects slightly below the lower end of pole piece.

Secured to the lower side of the ring 6, and centrally located thereon, is a subole 7, said sub-pole being lreferably forge from soft iron or steel. beneath the inner pole 3 and, in eect completes said ole, although it is sli htly separated there rom, as shown, by a tin, plate 8, This separation of the subole rom the inner pole causes the magnet to ose its ma netization ra lease tie body to w ich it is adhering more readily than it would otherwise do. The sub-pole may be connected to the ring 6 in any suitable manner, as by rivets 9.

lnclosed within the annular space that sub-pole is\ directly v.

idly, so that it will re-- copper surrounds the inner pole and that is formed said coils being arranged concentrically' about the inner pole. v A

The positive and negative terminals a and b, from the generator are connected to the switch lugs 12 and 13, and to these switch lugs are llkewise connected one end of each of the coils 10 and 11, the switch lugs being mounted on, and suitably insulated from each other by a block of insulating material 14, which is placed in a recess or chamber 15 that is formed on and within the upper surface of the magnet. This block 14 may be formed of any suitable material having the necessary insulatin roperties. This block also carries two ad itlonal sets of switch lugs 16, 17 and 18, 19, the lugs 16 and 17 being suitably insulated from each other, while the lugs 18 and 19 are connected by a shunt wire 2U. Pivoted to the lugs 16 and 17 is a three-Way switch 21. To the lugs 16 and 17 are connected the other ends of the magnet coils, it being remembered that one of the ends of said coils is res ectively attached to the lugs 12 and 13. T e recess or chamber 15 is referably closed when in use by a cover 22, w ich may be pivoted to the magnet at 'lhe current, however, divides at the lug 12, part ol the saine passing through the switch to the lug 1G, thence through the coil 10, to the lug 13 and the terminal b. lt will be seen therefore that when the switch is in the said position, the coils 1() and 11 are in par allel. "hen, however, the switch is thrown over into engagement with the lugs 18 and 1t), the current does not divide at the lug 12, but it all passes through theeoil 11 to the lug 17, thence through the switch to the lug 19, through the. shunt 20 to the lug 18, through the switch to the lug 16, and thence through the coil 10 and lug 13 to the terminal b. W'hen in the latter position, therefore, the coils are in series. rlhis arrangement of the coils is especially' important, since the magnet may then be used upon circuits oi diiler ent voltage; that is to say, if the generator furnishes current at 100 Volts, the coils may be placed in parallelmwhileif the current is furnished at L0 volts, the coils will be connected in series, and the current flowing through each ot the coils will be substantially the same as before.

By making the outer pole. Lt separate from the member 1, a much better and sounder casting can be secured than when these parts are east. integrally. 'lhis is a very in'lportant tac-tor in devices oil this kind, as an imjieriect casting will not only be unsafe in use, but its reluctance to the passagel of the magnetic lilies of torce is greatly increased, thereby impairing the ellciency ol' the magnet.

While .l have shown but two coils for the. magnet, it is obvious that a greater number ol such coils may be employed, if desired, and the following claims calling for a plurality of coils are not to be construed as limited to the two coils shown.

llaving thus described my invention, l claim:

1. ln a litt magnet, a main member having a. central projection l'orming an inner pole ot' the magnet, a member surrounding said projection forming an outer pole member. a magnetic coil between `said poles, aml a subpole magnetically separated from the coils and the inner pole,

2. ln a lil't magnet, a main member having a central projection l'orming an inner poley ol' the magnet, a member lsurroumling said projection forming an outer pole oll the magnet, a magnetic coil between said poles, and a.

sub-pole supported by the outer pole member magnetically separated trom the coils and the inner pole.

3. vln aflit'ting magnet, a main member having a cent ral projection toi-ming the inner pole ol' the magnet member surrounding said projection forming the outer pole, a magnetic coil tor energizing the magnet, a sub-pole carried by said magnet in front oi' one oln the poles thereof, and means for separating the said subpole trom its adjacent pole, whereby the denlagnetizatirin ol' the magnet is facilitated.

4. ln a li'l'ting magnet, a main member having a central projection forming the. inner pole of the magnet; a member surrounding said projection forming the outer pole, a magnetic coil for energizing the magnet, a sub-pole carried by said magnet in front ot the inner pole, and means for separating the said sub-pole from the inner pole, whereby the demagnetization of the magnet is facilitate-d.

5'. In a lifting magnet, a main member having at its center a projection forming the inner pole of the magnet, the outer pole ot' the magnet surrounding said inner pole and Secured to the said main member, said outer pole being provided with an inwardly turned ledgel or shoulder, a plate otI non-magnetic material resting upon said ledge or shoulder, a magnetic coil surrounding the inner pole ot' the magnet and resting upon said non-magnetic plate, and a sub-pole in t'ront ot said inner pole, and magnetically separated therel'rom.

ti. ln a lit'ting magnet, a main member having at its center a projection l'orming the inner pole ol' the magnet, the outer polel ol' the magnet surrounding the inner pole and secured to the saidineinber, said outer pole being provided on its inner sidewith a projecting ledge or shoulder, an annular ring of non-magnetic material supported upon said ledge, a sub-pole Jfor the inner pole of the magnet, said sub-pole being attached to said ring. and being separated trom the said inner pole, and a magnetic coil surrounding the said inner pole and resting upon said ring.

7. ln a lifting magnet, a plurality of magnet coils lor energizing the magnet, and means 'lor placing said coils in parallel or in series as may be desired, whereby the magnet is adapted for use with currents of dillerent Voltage.

S. In ay lil'ting magnet, a plurality of magnetic coils for energizing the magnet and a three-wayr switch connected with said coils and being adapted by its dill`erent positions to place said coils in parallel with each other or in series, whereby the magnet is adapted lor use with currents ot` dillerent voltage.

0. ln a lifting magnet, electric terminals, a pair olI switch lugs, 12 and 15?, to which said terminals are connected, an additional pair ol switch lugs, lt and 17, a magnetic coil having its ends coimected with the lugs 12 and v17, a second magnetic. coil having its ends connected with the lugs 13 and 16, a third pair of switch lugs, 1S and 111, a shunt wire connecting the latter pair otE lugs, and a. switch connected with the pair ot lugs 16 and 17, and adapted to be thrown into connection with either of the other pairs ot' lugs, whereby the coils maybe placed in parallel or in series as desired.

llt)

10. In a lifting magnet, a main member having at its center a projection forming an inner pole piece, an outer pole piece surrounding the inner pole piece and secured to y said main member, a plurality of magnetic coils concentrically arranged about the inner pole piece, and means for placing said coils in parallel with each other or in series as de-l sired, whereby the magnet is adapted for use with currents of different voltage.

11. In a lifting magnet, a main member having at its center a projection forming an inner pole piece, an outer pole piece surrounding the inner pole piece and secured to said main member, a plurality of magnetic coils concentrically arranged about the inner pole piece, means for placing said coils in parallel with each other or in series as desired, whereby the ma net is adapted for use with currents of diflerent voltage, and a sub-pole in front of the inner pole and separated therefrom, for the purpose specified.

12. In a lifting magnet, a main member 4having a projection at its center forming the inner pole of the magnet, an vouter pole for said magnet secured to said member, said outer pole being provided with an inwardly extending ledge or shoulder, a ring of nonmagnetic material resting upon said ledge or shoulder, a plurality of concentric magnetic coils surrounding the inner pole and resting upon said non-magnetic ring, and means for connecting said coils in parallel with each other or in series, as desired, whereby the magnet is-adapted for use with currents of different voltage.

13. In a lifting magnet, a main member having a projection at its center forming the inner pole of the magnet, the outerpole of the magnets secured to said member, said outer pole being provided on its interior with an inwardly projecting ledge or shoulder, a.n annular ring of non-magnetic material surroundin the inner ole and resting upon the saidledge or shoulder, a plurality of magnetic coils surrounding the inner pole and resting upon the said ring, means whereb said coils may be placed in parallel with eac 1 other or in series as desired, whereby the magnet is adapted for use with coils of different voltage, and a sub-pole opposite the inner pole and carried by said non-magnetic ring, said sub-pole being spaced from the said inner pole for the purpose specified.

' 14. In a lifting magnet, a main member having a projection at its center forming the inner' pole of the magnet, the outer pole of the magnet secured to said member, said outer pole being provided on its interior with an inwardly projecting ledge or shoulder, an annular ring' of brass surrounding the inner pole and resting upon the said ledge or shoulder, a plurality of magnetic coils surrounding the inner pole and resting uponthe said ring, means whereby said coils may be placed in parallel with each other or in series as desired, whereby the magnet is adapted for use with coils of diierent voltage, a sub-pole opposite the inner pole and carried by said non-magnetic ring, and a thin plate of copper separating the sub-pole from the inner pole, for the purpose specified.

15. In a lifting magnet, a main cast-steel member having` a central projection forming an inner pole, a cast-steel outer pole piece carried by the main member and surrounding the inner pole, said outer pole piece being provided with an interior ledge or shoulder, a brass plate surrounding the inner pole, and resting on said ledge or shoulder, a plurality of magnetic coils between said poles and resting on said brass plate, a switch chamber on said main member, a switch within said chamber, connections within the chamber whereby the switch may place said coils in parallel or'in series, as desired, a forged sub-pole secured to the said brass plate below the said inner pole, and -a copper plate resting upon the said sub-pole and separatin the latter from the said inner pole, for t e purpose specified.

16. In a lifting magnet, a main member supporting magnetic poles and a sub-pole 'magnetically separated from both thepole members.

In testimony whereof, I hereunto aflix my signature in the presence of two witnesses.'

. VICTOR R. BROWN IN G.

Witnesses:

WILLIAM H. WAITE, ALLEN H. FOSTER. 

